Fix: BEM記法だとwarningになってしまっていたので'both'にして両対応

.htmlhintrc

@@ -13,7 +13,7 @@
      "head-script-disabled": false,
      "img-alt-require": true,
      "doctype-html5": true,
-     "id-class-value": "dash",
+     "id-class-value": "both",
      "style-disabled": false,
      "space-tab-mixed-disabled": true,
      "id-class-ad-disabled": true,